Dropdownlist using viewbag data in mvc4 using c#

Dropdownlist using viewbag data in mvc4 using c#

Hi i want to fill a dropdown list in my view page my code is
public class MemberBasicData
{
public int Id { get; set; }
public string Mem_NA { get; set; }
public string Mem_Occ { get; set; }
}
//controller
public ActionResult Register()
{
var users = new Member().GetAllMembers();
ViewBag.Users = users;
return View();
}
//View
@model IEnumerable<Puthencruz.Rotary.Members.Models.MemberBasicData>
@Html.DropDownListFor(model => model.Mem_Na, (SelectList)ViewBag.Users,
"--Select Users--")
i want to add Mem_NA to dropdownlist, Viewbag contains all the user
details. Problem is in View page. An error shows in model.Mem_Na. Please
help me to solve this.